range

(PHP 4, PHP 5, PHP 7, PHP 8)

rangeСоздаёт массив, содержащий диапазон элементов

Описание

range(string|int|float $start, string|int|float $end, int|float $step = 1): array

Создаёт массив, содержащий диапазон элементов.

Если оба параметра — start и end — будут строками (string), а параметр step — числом (int), то созданный массив будет последовательностью байтов. В других случаях созданный массив будет последовательностью чисел.

Последовательность будет возрастать, если значение параметра start меньше или равно значению параметра end. В противном случае последовательность будет убывать.

Список параметров

start

Первое значение последовательности.

end

Последнее значение последовательности.

step

Параметр step определяет, на сколько будут изменяться значения в создаваемой последовательности.

В параметр step можно передавать отрицательное значение, если нужно создать убывающую последовательность.

Если значение параметра step будет числом с плавающей точкой (float) без дробной части, то оно будет интерпретировано как целое число (int).

Возвращаемые значения

Возвращает последовательность элементов в виде массива (array), в котором первый элемент получает значение параметра start, а последний — параметра end, в которой каждое значение последовательности отстаёт от другого на указанное в параметре step количество шагов.

Последний элемент возвращённого массива будет равен либо значению параметра end, либо предыдущему значению последовательности, в зависимости от значения параметра step.

Если оба параметра — start и end — будут строками (string), а параметр step — числом (int), то созданный массив будет последовательностью байтов, обычно латинских символов в кодировке ASCII.

Если хотя бы одно из значений параметров start, end, или step будет числом с плавающей точкой (float), созданный массив будет последовательностью значений float.

В противном случае созданный массив будет последовательностью целых чисел (int).

Ошибки

  • Если значение параметра step будет равно 0, будет выброшено исключение ValueError.
  • Если значение хотя бы одного из параметров start, end, или step окажется недопустимым конечным числом, как его определяет функция is_finite(), будет выброшено исключение ValueError.
  • Если значение параметра step будет отрицательным при создании возрастающей последовательности (т. е. $start <= $end), будет выброшено исключение ValueError.
  • Если значение хотя бы одного из параметров start или end будет пустой строкой (''), это приведёт к ошибке уровня E_WARNING, а пустая строка будет интерпретирована как целое число 0.
  • Если значение хотя бы одного из параметров start или end окажется нечисловой строкой размером более одного байта, будет сгенерирована ошибка уровня E_WARNING.
  • Если значение хотя бы одного из параметров start или end окажется строкой, которая неявно приводится к целому числу (int) из-за того, что другое значение — число, возникнет ошибка уровня E_WARNING.
  • Если значение хотя бы одного из параметров step будет числом с плавающей точкой (float), а значение параметров start и end окажется нечисловой строкой, будет сгенерирована ошибка уровня E_WARNING.

Список изменений

Версия Описание
8.3.0 Если значения обоих параметров — start и end — окажутся строками, то теперь функция range() всегда будет создавать массив (array) байтов. Ранее, если один из символов в строке был числом, другие символы неявно приводились к числу (int).
8.3.0 Теперь появляется ошибка уровня E_WARNING, если значение хотя бы одного из параметров start или end оказывается строкой, которая неявно приводится к целому числу (int) из-за наличия в ней числовых символов.
8.3.0 Теперь появляется ошибка уровня E_WARNING, если значение хотя бы одного из параметров start или end оказывается нечисловой строкой с размером более одного байта.
8.3.0 Теперь появляется ошибка уровня E_WARNING, если значение хотя бы одного из параметров start или end оказывается пустой строкой.
8.3.0 Если значение параметра step окажется числом с плавающей точкой (float) без дробной части, оно будет интерпретировано как целое число (int).
8.3.0 Теперь выбрасывается исключение ValueError, если при создании восходящей последовательности значение параметра step оказывается отрицательным числом.
8.3.0 Теперь выбрасывается исключение ValueError, если значение параметра step не является допустимым конечным числом.
8.3.0 Теперь выбрасывается исключение TypeError, если значение хотя бы одного из параметров start или end окажется массивом (array), объектом (object) или ресурсом (resource). Ранее они неявно приводились к целому числу (int).

Примеры

Пример #1 Примеры использования range()

<?php
echo implode(', ', range(0, 12)), PHP_EOL;

echo
implode(', ', range(0, 100, 10)), PHP_EOL;

echo
implode(', ', range('a', 'i')), PHP_EOL;

echo
implode(', ', range('c', 'a')), PHP_EOL;

echo
implode(', ', range('A', 'z')), PHP_EOL;
?>

Результат выполнения приведённого примера:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100
a, b, c, d, e, f, g, h, i
c, b, a
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, [, \, ], ^, _, `, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z

Смотрите также

add a note

User Contributed Notes 30 notes

up
130
Palz
11 years ago
To create a range array like

Array
(
[11] => 1
[12] => 2
[13] => 3
[14] => 4
)

combine two range arrays using array_combine:

array_combine(range(11,14),range(1,4))
up
13
php at keith tyler dot com
10 years ago
So with the introduction of single-character ranges to the range() function, the internal function tries to be "smart", and (I am inferring from behavior here) apparently checks the type of the incoming values. If one is numeric, including numeric string, then the other is treated as numeric; if it is a non-numeric string, it is treated as zero.

But.

If you pass in a numeric string in such a way that is is forced to be recognized as type string and not type numeric, range() will function quite differently.

Compare:

<?php
echo implode("",range(9,"Q"));
// prints 9876543210

echo implode("",range("9 ","Q")); //space after the 9
// prints 9:;<=>?@ABCDEFGHIJKLMNOPQ

echo implode("",range("q","9 "));
// prints qponmlkjihgfedcba`_^]\[ZYXWVUTSRQPONMLKJIHGFEDCBA@?>=<;:987654
?>

I wouldn't call this a bug, because IMO it is even more useful than the stock usage of the function.
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13
gtisza at gmail dot com
11 years ago
You might expect range($n, $n-1) to be an empty array (as in e.g. Python) but actually PHP will assume a step of -1 if start is larger than end.
up
9
Alien426
8 years ago
The function will generate an array of integers even if your numerical parameters are enclosed in quotes.
<?php
var_dump
( range('1', '2') ); // outputs array(2) { [0]=> int(1) [1]=> int(2) }
?>

An easy way to get an array of strings is to map strval() to the range:
<?php
var_dump
( array_map('strval', range('1', '2')) ); // outputs array(2) { [0]=> string(1) "1" [1]=> string(1) "2" }
?>
up
5
ccb_bc at hotmail dot com
4 years ago
<?php
function natural_prime_numbers(array $range, bool $print_info = false) : array {
$start_time = time();
$primes_numbers = array();
$print = '';
$count_range = count($range);
foreach(
$range as $number){
$values_division_number = array();
if(
$number === 0 || $number === 1 || !is_int($number)){ // eliminate 0, 1 and other no integer
continue;
}
if(
$number != 2 && $number%2 === 0){ // eliminate 2 and pairs numbers
continue;
}
for(
$i = 1; $i <= $number; $i++){
$resultado_divisao = $number / $i;
$values_division_number[$i] = $resultado_divisao;

if(
$count_range <= 20){ // $count_range <= 20 (+ performance)
$print .= PHP_EOL;
$info = 'The number '.$number.' divided by the number '.$i.' is equal to: '.($number / $i);
$print .= $info;
if(
$i === $number){
$print .= PHP_EOL;
}
}

array_walk($values_division_number, function($value, $index) use (&$values_division_number, &$number){ // reference change values
// eliminate floats and others numbers not are equal 1 and own number
if(is_float($value) && $value != $number && $value > 1){
unset(
$values_division_number[$index]);
}
});

$values_division_number = array_values($values_division_number); // reindex array

// here we want only array with 2 indexes with the values 1 and own number (rule to a natural prime number)
if(count($values_division_number) === 2 && $values_division_number[0] === $number && $values_division_number[1] === 1){
$primes_numbers[$number] = $number;
}

}
}
return array(
'length_prime_numbers' => count($primes_numbers),
'prime_numbers' => array_values($primes_numbers),
'print' => $print,
'total_time_processing' => (time() - $start_time).' seconds.',
);
}
var_dump(natural_prime_numbers(range(0, 11))); // here the range() function ;-)

// Result:
// array (size=3)
// 'length_prime_numbers' => int 5
// 'prime_numbers' =>
// array (size=5)
// 0 => int 2
// 1 => int 3
// 2 => int 5
// 3 => int 7
// 4 => int 11
// 'print' => string '
// O número 2 dividido pelo número 1 é igual a: 2
// O número 2 dividido pelo número 2 é igual a: 1

// O número 3 dividido pelo número 1 é igual a: 3
// O número 3 dividido pelo número 2 é igual a: 1.5
// O número 3 dividido pelo número 3 é igual a: 1

// O número 5 dividido pelo número 1 é igual a: 5
// O número 5 dividido pelo número 2 é igual a: 2.5
// O número 5 dividido pelo número 3 é igual a: 1.6666666666667
// O número 5 dividido pelo número 4 é igual a: 1.25
// O número 5 dividido pelo '...

// **************************** //
//
// * Remember that the function is recursive, that is: a range of 5000 takes more than 1 minute on a processor Intel® Core™ i5-8250U (3.40 GHz).
//
// **************************** //
?>
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8
luca.favorido ATgmailDOT com
7 years ago
The function "range" is very useful to get an array of characters as range('C','R') does.

At work, I had to extend the function range($a,$b) to work in this special case: with two uppercase strings $a and $b, it should return all the possible strings between $a and $b.
This could be used for example to get the excel column indexes.
e.g. <?php range('A','AD') ==> array('A','B','C',...,'Z','AA','AB','AC','AD') ?>

So I wrote the function getrange($min,$max) that exactly does this.

<?php

function getcolumnrange($min,$max){
$pointer=strtoupper($min);
$output=array();
while(
positionalcomparison($pointer,strtoupper($max))<=0){
array_push($output,$pointer);
$pointer++;
}
return
$output;
}

function
positionalcomparison($a,$b){
$a1=stringtointvalue($a); $b1=stringtointvalue($b);
if(
$a1>$b1)return 1;
else if(
$a1<$b1)return -1;
else return
0;
}

/*
* e.g. A=1 - B=2 - Z=26 - AA=27 - CZ=104 - DA=105 - ZZ=702 - AAA=703
*/
function stringtointvalue($str){
$amount=0;
$strarra=array_reverse(str_split($str));

for(
$i=0;$i<strlen($str);$i++){
$amount+=(ord($strarra[$i])-64)*pow(26,$i);
}
return
$amount;
}
?>
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17
ThinkMedical at Gmail dot com
15 years ago
foreach(range()) whilst efficiant in other languages, such as python, it is not (compared to a for) in php*.

php is a C-inspired language and thus for is entirely in-keeping with the lanuage aethetic to use it

<?php
//efficiant
for($i = $start; $i < $end; $i+=$step)
{
//do something with array
}

//inefficiant
foreach(range($start, $end, $step) as $i)
{
//do something with array
}
?>

That the officiant documentation doesnt mention the for loop is strange.

Note however, that in PHP5 foreach is faster than for when iterating without incrementing a variable.

* My tests using microtime and 100 000 iterations consistently (~10 times) show that for is 4x faster than foreach(range()).
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4
jazzduck AT gmail DOT com
10 years ago
Despite the line above that says that the $step value should be "given as a positive number," the range() function will in fact correctly handle reversed (decrementing) ranges. For example:

<?php print_r( range( 24, 20 ) ); ?>
Array
(
[0] => 24
[1] => 23
[2] => 22
[3] => 21
[4] => 20
)

<?php print_r( range( 20, 11, -3 ) ); ?>
Array
(
[0] => 20
[1] => 17
[2] => 14
[3] => 11
)

It will actually ignore the sign of the $step argument, and determine whether to increment or decrement based purely on whether $start > $end or $end > $start. For example:

<?php print_r( range( 20, 11, 3 ) ); ?>
Array
(
[0] => 20
[1] => 17
[2] => 14
[3] => 11
)

<?php print_r( range( 11, 20, -3 ) ); ?>
Array
(
[0] => 11
[1] => 14
[2] => 17
[3] => 20
)
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8
ktamas77 at gmail dot com
11 years ago
if you need zero padding, string prefixes or any other masks, then a simple combination of array_map, inline functions and sprintf is your friend.

<?php

$a
= array_map(function($n) { return sprintf('sample_%03d', $n); }, range(50, 59) );

print_r($a);

?>

Will result:

Array
(
[0] => sample_050
[1] => sample_051
[2] => sample_052
[3] => sample_053
[4] => sample_054
[5] => sample_055
[6] => sample_056
[7] => sample_057
[8] => sample_058
[9] => sample_059
)
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6
chris at laflash dot org
17 years ago
Quick HTML menus with minimum and maximum sets of years:

<?php
/*
** Quick HTML menus with minimum and maximum sets of years.
** @author Chris Charlton <chris@laflash.org>
** @license FREE!
*/

// Years range setup
$year_built_min = 1900;
$year_built_max = date("Y");
?>
<select id="yearBuiltMin" size="1">
<?php // Generate minimum years

foreach (range($year_built_min, $year_built_max) as $year) { ?>
<option value="<?php echo($year); ?>"><?php echo($year); ?></option>
<?php } ?>
</select>

<select id="yearBuiltMax" size="1">
<?php // Generate max years

foreach (range($year_built_max, $year_built_min) as $year) { ?>
<option value="<?php echo($year); ?>"><?php echo($year); ?></option>
<?php } ?>
</select>
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6
m0sh3 at hotmail dot com
17 years ago
Here's how i use it to check if array is associative or not:

<?php

if (array_keys($arr)===range(0, sizeof($arr)-1)) {
// not associative array

} else {
// associative array

}

?>
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3
Ray.Paseur often uses Gmail
10 years ago
Interestingly, these two statements produce identical 26-character alphabet arrays.

<?php
$arr
= range('A', 'Z');
$arr = range('AA', 'ZZ');
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6
dries at volta dot be
12 years ago
Ever wanted to generate an array with a range of column names for use in Excel file related parsing?
I've wrote a function that starts at the A column and adds column names up until the column you specified.

<?php

/**
* This function creates an array with column names up until the column
* you specified.
*/
function createColumnsArray($end_column, $first_letters = '')
{
$columns = array();
$length = strlen($end_column);
$letters = range('A', 'Z');

// Iterate over 26 letters.
foreach ($letters as $letter) {
// Paste the $first_letters before the next.
$column = $first_letters . $letter;

// Add the column to the final array.
$columns[] = $column;

// If it was the end column that was added, return the columns.
if ($column == $end_column)
return
$columns;
}

// Add the column children.
foreach ($columns as $column) {
// Don't itterate if the $end_column was already set in a previous itteration.
// Stop iterating if you've reached the maximum character length.
if (!in_array($end_column, $columns) && strlen($column) < $length) {
$new_columns = createColumnsArray($end_column, $column);
// Merge the new columns which were created with the final columns array.
$columns = array_merge($columns, $new_columns);
}
}

return
$columns;
}

?>

Usage:

<?php

// Return an array with all column names from A until and with BI.
createColumnsArray('BI');

?>
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9
me at phpscott dot com
12 years ago
So, I needed a quick and dirty way to create a dropdown select for hours, minutes and seconds using 2 digit formatting, and to create those arrays of data, I combined range with array merge..

<?php
$prepend
= array('00','01','02','03','04','05','06','07','08','09');
$hours = array_merge($prepend,range(10, 23));
$minutes = array_merge($prepend,range(10, 59));
$seconds = $minutes;
?>

Super simple.
up
5
captvanhalen at gmail dot com
16 years ago
Here is a home rolled range() function that uses the step feature for those unfortunate souls who cannot use PHP5:

<?php
function my_range( $start, $end, $step = 1) {

$range = array();

foreach (
range( $start, $end ) as $index) {

if (! ((
$index - $start) % $step) ) {
$range[] = $index;
}
}

return
$range;
}
?>
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2
moficer at host dot sk
8 years ago
php 5.6.16

<?php
var_export
(range('Z', 'a'));

/*
array (
0 => 'Z',
1 => '[',
2 => '\\',
3 => ']',
4 => '^',
5 => '_',
6 => '`',
7 => 'a',
)
*/
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3
jay at NOspam dot myd3 dot com
15 years ago
This is a modified version of thomas' range_string() function. It's simpler, cleaner, and more robust, but it lacks the advanced features his function had, hopefully it will be of assitance to someone.

Examples:

input: "1, 2, 3, 4, 5, 6" --> output: 1, 2, 3, 4, 5, 6
input: "1-6" --> output: 1, 2, 3, 4, 5, 6
input: "1-6" --> output: 1, 2, 3, 4, 5, 6
input: "1 - -6" --> output: 1, 2, 3, 4, 5, 6
input: "0 - 0" --> output: 0
input: "1, 4-6, 2" --> output: 1, 2, 4, 5, 6
input: "6,3-1" --> output: 1, 2, 3, 6

<?php

define
('RANGE_ARRAY_SORT', 1);
define('RANGE_ARRAY', 2);
define('RANGE_STRING_SORT', 3);
define('RANGE_STRING', 4);

function
range_string($range_str, $output_type = RANGE_ARRAY_SORT)
{
// Remove spaces and nother non-essential characters
$find[] = "/[^\d,\-]/";
$replace[] = "";

// Remove duplicate hyphens
$find[] = "/\-+/";
$replace[] = "-";

// Remove duplicate commas
$find[] = "/\,+/";
$replace[] = ",";

$range_str = preg_replace($find, $replace, $range_str);

// Remove any commas or hypens from the end of the string
$range_str = trim($range_str,",-");

$range_out = array();
$ranges = explode(",", $range_str);

foreach(
$ranges as $range)
{

if(
is_numeric($range) || strlen($range) == 1)
{
// Just a number; add it to the list.
$range_out[] = (int) $range;
}
else if(
is_string($range))
{

// Is probably a range of values.
$range_exp = preg_split("/(\D)/",$range,-1,PREG_SPLIT_DELIM_CAPTURE);

$start = $range_exp[0];
$end = $range_exp[2];

if(
$start > $end)
{
for(
$i = $start; $i >= $end; $i -= 1)
{
$range_out[] = (int) $i;
}
}
else
{
for(
$i = $start; $i <= $end; $i += 1)
{
$range_out[] = (int) $i;
}
}

}
}

switch (
$output_type) {
case
RANGE_ARRAY_SORT:
$range_out = array_unique($range_out);
sort($range_out);

case
RANGE_ARRAY:
return
$range_out;
break;

case
RANGE_STRING_SORT:
$range_out = array_unique($range_out);
sort($range_out);

case
RANGE_STRING:

default:
return
implode(", ", $range_out);
break;
}
}

// Sample Usage:
$range = range_string("6, 3-1");

?>
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2
krdr dot mft at gmail dot com
10 years ago
I've been introduced with range() function not so long ago, and I found that examples about it is somewhat wrong, even inefficient:

<?php
$o
= "";
$time_start = microtime(true);
foreach(
range(1, 10000) as $val) {
$o .= $val;
}
$time_end = microtime(true);
$time = $time_end - $time_start;
echo
'rangein: '.$time.'<br />';

$o = "";
$time_start = microtime(true);
$a = range(1, 10000);
foreach(
$a as $val) {
$o .= $val;
}
$time_end = microtime(true);
$time = $time_end - $time_start;
echo
'rangeout: '.$time.'<br />';

?>

Which gives results:

rangein: 0.0025348663330078
rangeout: 0.0019199848175049

In some cases difference is even bigger and proportional to the range generated. I suppose that results of range() are cached/hashed.

Note: execution order does affects execution times, but difference still exists
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1
qz
8 years ago
If you're looking to fill an array to get a hash with 0-9 numerical values, using
range(0,9);
is a faster solution compared to
array_fill(0, 10, '');
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1
manuel at levante dot de
17 years ago
<?php
function srange ($s) {
preg_match_all("/([0-9]{1,2})-?([0-9]{0,2}) ?,?;?/", $s, $a);
$n = array ();
foreach (
$a[1] as $k => $v) {
$n = array_merge ($n, range ($v, (empty($a[2][$k])?$v:$a[2][$k])));
}
return (
$n);
}

$s = '1-4 6-7 9-10';
print_r(srange($s));
?>

Return:
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 6
[5] => 7
[6] => 9
[7] => 10
)
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1
VivienG
8 months ago
They forgot to say something.
If the ending value not encounter the last sequence, the function return false.
In other words :
Given a int $n, if ( $start + $n * $step ) < $end and ( $start + ( $n + 1 ) * $step ) > $end, the function doen't give the maximum possible range, it returns a boolean.
So the last range number HAVE TO BE the end number.
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1
mohammed dot hussein dot mahmoud at gmail dot com
2 years ago
You could use negative numbers in place of the `step` parameter. You need to make sure that the `start` is bigger than `end`. Note that range() function in php generates the range inclusive, i.e. it also includes the `end` parameter and not just up to it but not including it like most other languages.
The following snippet of code should explain what I mean about negative steps:

<?php

// 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0
print_r(range(100, 0, -10));

?>

What happens basically is that the range function does not really care about what is bigger or smaller, it just adds the step to the start and appends that to the a temp result variable as long as it did not reach the end param value. In this case, adding negative numbers is like minus (computers do that for 2's complement under the hood.) This will cause the number to go from 100 to 90 and then the function will check if 90 reached 0 yet. Since it wouldn't have done that, it will keep adding -step (-10 in that case) to the latest result (i.e. 90) and so on and so forth.

Since range() is said to be better and faster than array_fill() I believe it was important for me to try it out and actually post this note on the official documentation just to make sure people can use this.
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0
lsblsb at gmx dot de
10 years ago
I needed a function, that creates a letter range with arbitrary length.
You specify via the $length parameter, how many entries you need.
Logic is analog to the logic of the column-titles in a calc-sheet.

<?php

/**
* create a letter range with arbitrary length
* @param int $length
* @return array
*/
function createLetterRange($length)
{
$range = array();
$letters = range('A', 'Z');
for(
$i=0; $i<$length; $i++)
{
$position = $i*26;
foreach(
$letters as $ii => $letter)
{
$position++;
if(
$position <= $length)
$range[] = ($position > 26 ? $range[$i-1] : '').$letter;
}
}
return
$range;
}
?>
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0
derek at php dot net
19 years ago
This should emulate range() a little better.
<?php
function range_wroar($low, $high, $step = 1) {
$arr = array();
$step = (abs($step)>0)?abs($step):1;
$sign = ($low<=$high)?1:-1;
if(
is_numeric($low) && is_numeric($high)) {
//numeric sequence
for ($i = (float)$low; $i*$sign <= $high*$sign; $i += $step*$sign)
$arr[] = $i;
} else {
//character sequence
if (is_numeric($low))
return
$this->range($low, 0, $step);
if (
is_numeric($high))
return
$this->range(0, $high, $step);
$low = ord($low);
$high = ord($high);
for (
$i = $low; $i*$sign <= $high*$sign; $i += $step*$sign) {

$arr[] = chr($i);
}
}
return
$arr;
}
?>
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-1
pyetrosafe at gmail dot com
10 years ago
To create a simple array or a multidimensional array with defined size and null values​​, use this expression:

<?php

$SimpleArray
= array_map(function($n) { return null; }, range(1, 3) );
$MultiArray = array_map(function($n) { return array_map(function($n) { return null; }, range(1, 2) ); }, range(1, 3) );

var_dump($SimpleArray);
var_dump($MultiArray);

// And will print:
?>
>>$SimpleArray
array(3) {
[0]=> NULL
[1]=> NULL
[2]=> NULL
}

>>$MultiArray
array(3) {
[0]=> array(2) {
[0]=> NULL
[1]=> NULL
}
[1]=> array(2) {
[0]=> NULL
[1]=> NULL
}
[2]=> array(2) {
[0]=> NULL
[1]=> NULL
}
}

?>
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-2
emory underscore smith at hotmail
18 years ago
since its not stated explicitly above, thought id point out that you arent limited to using integers.

however, be careful when doing so, as you might not get the range you expect!

to illustrate:

<?php
$am
= range(500,1600,10);
$fm = range(88.1,107.9,.2);
print_r($am);
print_r($fm);
?>

print_r($am) yields the expected result:

Array
(
[0] => 500
[1] => 510
[2] => 520
...
[109] => 1590
[110] => 1600
)

print_r($fm), however, falls a bit (1%) short:

Array
(
[0] => 88.1
[1] => 88.3
[2] => 88.5
...
[97] => 107.5
[98] => 107.7
)

so, if you want to use a non-integral step size params for numeric ranges, be sure to account for fp representation accuracy and error accumulation; a step size of something like pi or 1/10 could spell disaster for a large range. if in doubt, use integral steps and divide ... something like <?php range(88.1,108,.2) ?> might work to recover 107.9, but would not be scalable like, say <?php array_map(create_function('$x','return $x/10;'),range(881,1079,2)) ?>.

-emory
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-2
subscription101 at hotmail dot com
18 years ago
A much simpler way of creating a range of even numbers is by starting with an even number:

<?php

range
(2, 10, 2);

?>
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-2
j dot gizmo at aon dot at
19 years ago
i figured i'd add some more functionality to the myRange() functions below.
now you can, besides giving a $step parameter,
1. count backwards
2. count with letters
3. give whatever parameter you want, there's nothing (i know of) that will cause an endless loop (try a negative $step for the previous function....)

<?php
function myRange($num1, $num2, $step=1)
{
if (
is_numeric($num1) && is_numeric($num2))
{
//we have a numeric range
$step = ( abs($step)>0 ? abs($step) : 1 ); //make $step positive
$dir = ($num1<=$num2 ? 1 : -1); //get the direction
for($i = (float)$num1; $i*$dir <= $num2*$dir; $i += $step*$dir)
{
$temp[] = $i;
}
}
else
{
//we have a character range
$num1=ord((string)$num1); //convert to ascii value
$num2=ord((string)$num2);
$step = ( abs($step)>0 ? abs($step) : 1 ); //make $step positive
$dir = ($num1<=$num2 ? 1 : -1); //get direction
for($i = $num1; $i*$dir <= $num2*$dir; $i += $step*$dir)
{
$temp[] = chr($i);
}
}
return
$temp;
}

print_r(myRange( 1, 3, 0.5 )); //you can use fractional steps
print_r(myRange( "a", "k", 3 )); //or count letters
print_r(myRange( "5", "9" )); //numbers are detected even if hidden in strtings
print_r(myRange( "!", "%", 1/pi() )); //or mess around with senseless parameters

?>
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-3
unicod3 at hotmail dot com
9 years ago
a function to get column index by letter

function getColumnNumber($char){
$alphabet = range('a','z');
$alphabet2 = range('a','z');
$newAlphabet = $alphabet;
foreach($alphabet as $k => $r)
{
foreach($alphabet2 as $row){
$newAlphabet[] = $r.$row;
}
}
$key = array_search($char, $newAlphabet);
return ($key !== false) ? $key : null;
}
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-5
Aram Kocharyan
13 years ago
Here's a function to generate ranges from strings:

<?php

/* Creates an array of integers based on a given range string of format "int - int"
Eg. range_str('2 - 5'); */
function range_str($str) {
preg_match('#(\\d+)\\s*-\\s*(\\d+)#', $str, $matches);
if (
count($matches) == 3 ) {
return
range($matches[1], $matches[2]);
}
return
FALSE;
}

// Test
$array = range_str(' 2 - 4 ');
print_r($array);

?>

This outputs:

Array
(
[0] => 2
[1] => 3
[2] => 4
)
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